engleski

Is Green Networking Beneficial in Terms of Device Lifetime?

This paper analyses the impact that sleep mode (SM)-based green strategies have on the reliability performance of optical and cellular network elements. First, we consider a device in isolation (i.e., not plugged into a network in operation), showing how operational temperature and temperature variations, both introduced by SM, impact its lifetime. We then evaluate, from an operational cost perspective, the impact of these lifetime variations, showing that some devices are critical, i.e., their achievable energy savings might not cover the potential additional reparation costs resulting from being put too frequently in SM. Moreover, we present a model for evaluating the impact of SM on the lifetime of a device plugged into a network in operation. The analysis considers two case studies (one based on optical backbone and one on cellular networks) showing that the lifetime of a device is influenced by both the hardware parameters (that depend on the specific design of the device) and the SM parameters (that instead depend on the energyefficient algorithm used, the network topology, and the traffic variations over time). Our results show that (i) the changes in the operational temperature and the frequency of their variation are two crucial aspects to consider while designing a SM-based green strategy, and (ii) the impact of a certain SM-based strategy on the lifetime of network devices is not homogeneous, i.e., it can vary through the network.

Sustainable Networks; Green Networking; Energy-Lifetime Tradeoff; Lifetime Models; Cellular Networks; Optical Networks

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